package sword.T25;

import util.ListNode;

/**
 * @File Info: leetcode -- <Solution>
 * @Author: 18362
 * @Create: 2022-03-28 0:33:09 星期一
 */

class Solution {
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        if (l1 == null || l2 == null)
            return l1 == null ? l2 : l1;
        ListNode dummy = new ListNode(), p = dummy;
        while (l1 != null && l2 != null) {
            if (l1.val <= l2.val) {
                p.next = l1;
                l1 = l1.next;
            } else {
                p.next = l2;
                l2 = l2.next;
            }
            p = p.next;
        }
        p.next = l1 == null ? l2 : l1;
        return dummy.next;
    }
}